What is the compression ratio achieved with these pistons?

These Mahle MS pistons feature a +9cc dish volume. When used with the appropriate cylinder head and gasket, they are designed to achieve a 12.5:1 compression ratio for the BMW S54 engine.

What material are these pistons made from?

The pistons are forged from 2618 aluminum. This is a strong and durable material commonly used in performance engine components to withstand high heat and pressure.

Are these pistons compatible with all S54 engines?

This piston set is specifically designed for the BMW S54 3.2L engine. It is crucial to verify that the bore size, stroke, connecting rod length, and wrist pin diameter match your specific engine build requirements.

Mahle S54B Piston Set 87.50mm Bore 12.5 CR 930000145

Name: Mahle MS Piston Set BMW S54B 87.50mm Bore 91.0mm Stroke 139mm Rod 21mm Pin +9cc 12.5 CR Set of 6
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-bmw-s54b-87-50mm-bore-91-0mm-stroke-139mm-rod-21mm-pin-t14-191467
Price: 1085.79 USD
Availability: BackOrder

Mahle MS Piston Set BMW S54B 87.50mm Bore 91.0mm Stroke 139mm Rod 21mm Pin +9cc 12.5 CR Set of 6

$1085.79

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle MS Piston Set for BMW S54B 3.2L engines. 87.50mm bore, 12.5:1 CR.

Key Features

Set of 6 Mahle MS pistons for BMW S54 3.2L engines.
87.50mm bore size.
Designed for a 91.0mm stroke and 139mm connecting rod.
Features a 21mm wrist pin diameter.
Includes a +9cc dish volume for a 12.5:1 compression ratio.
Constructed from forged 2618 aluminum for strength and durability.

This piston set is designed for the BMW S54 3.2L engine. Not CARB approved; cannot ship to California.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

This is a Mahle MS Piston Set specifically for the BMW S54 3.2L engine. If you're rebuilding or upgrading the heart of your S54, these pistons are built to handle the demands of a high-performance engine. They feature an 87.50mm bore and are designed for a 91.0mm stroke with a 139mm connecting rod and a 21mm wrist pin.

Mahle is known for well-built engine components, and this set is no exception. These pistons are forged from 2618 aluminum, a strong material commonly used in performance applications for its durability and ability to withstand high temperatures and pressures. They come with a +9cc dish volume, which helps achieve a 12.5:1 compression ratio when paired with the correct cylinder head and gasket combination. Each piston weighs in at 357g, contributing to a balanced rotating assembly. This set includes six pistons, ready for your engine build.

Please note that this piston set is not CARB approved and cannot be shipped to California. It's important to check all manufacturer specifications and ensure compatibility with your specific engine build before installation. Refer to the manufacturer's installation instructions for proper fitment and assembly procedures.